Fixing fields in YAML header to conform to site requirements

1.  Removed extraneous '0' from end date.
2.  Removed affiliations from instructor names so that names would match database.
3.  Turned 'assistant' back into 'helper' (but kept titling text in web page the same).
Merge pull request #1 from gvwilson/patch-1

Fixing fields in YAML header to conform to site requirements